TAILIEUCHUNG - Rezek et al. Nanoscale Research Letters 2011, 6:238

Rezek et al. Nanoscale Research Letters 2011, 6:238 NANO REVIEW Open Access Synthesis, structure, and opto-electronic properties of organic-based nanoscale heterojunctions Bohuslav Rezek1*, Jan Čermák1, Alexander Kromka1, Martin Ledinský1, Pavel Hubík1, Jiří J Mareš1, Adam Purkrt1,2, Vĕra Cimrová2, Antonín Fejfar1, Jan Kočka1 Abstract Enormous research effort has been put into optimizing organic-based opto-electronic systems for efficient generation of free charge carriers. This optimization is mainly due to typically high dissociation energy ( eV) and short diffusion length (10 nm) of excitons in organic materials. Inherently, interplay of microscopic structural, chemical, and opto-electronic properties plays crucial role. We show that employing and combining advanced scanning. | Rezek et al. Nanoscale Research Letters 2011 6 238 http content 6 1 238 o Nanoscale Research Letters a SpringerOpen Journal NANO REVIEW Open Access Synthesis structure and opto-electronic properties of organic-based nanoscale heterojunctions 1 1 1 1 1 1 Bohuslav Rezek Jan Cermák Alexander Kromka Martin Ledinský Pavel Hubík Jiri J Mares Adam Purkrt Vẽra Cimrová2 Antonín Fejfar1 Jan Kocka1 Abstract Enormous research effort has been put into optimizing organic-based opto-electronic systems for efficient generation of free charge carriers. This optimization is mainly due to typically high dissociation energy eV and short diffusion length 10 nm of excitons in organic materials. Inherently interplay of microscopic structural chemical and opto-electronic properties plays crucial role. We show that employing and combining advanced scanning probe techniques can provide us significant insight into the correlation of these properties. By adjusting parameters of contact- and tapping-mode atomic force microscopy AFM we perform morphologic and mechanical characterizations nanoshaving of organic layers measure their electrical conductivity by currentsensing AFM and deduce work functions and surface photovoltage SPV effects by Kelvin force microscopy using high spatial resolution. These data are further correlated with local material composition detected using microRaman spectroscopy and with other electronic transport data. We demonstrate benefits of this multi-dimensional characterizations on i bulk heterojunction of fully organic composite films indicating differences in blend quality and component segregation leading to local shunts of photovoltaic cell and ii thin-film heterojunction of polypyrrole PPy electropolymerized on hydrogen-terminated diamond indicating covalent bonding and transfer of charge carriers from PPy to diamond. Introduction Electronic devices nowadays are commonly based on inorganic semiconductors . silicon or .

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